<template>
  <div
    class="player"
    v-show="playList.length > 0"
  >
    <transition
      name="normal"
      @enter="enter"
      @after-enter="afterEnter"
      @leave="leave"
      @after-leave="afterLeave"
    >
      <!--播放页面全屏-->
      <div
        class="normal-player"
        v-show="fullScreen"
      >
        <!--背景 模糊-->
        <div class="background">
          <img
            :src="currentSong.image"
            alt=""
            width="100%"
            height="100%"
          >
        </div>
        <!--顶部-->
        <div class="top">
          <div
            class="back"
            @click="back"
          >
            <i class="icon-back"></i>
          </div>
          <h1
            class="title"
            v-html="currentSong.name"
          ></h1>
          <h2
            class="subtitle"
            v-html="currentSong.singer"
          ></h2>
        </div>
        <!--中间cd部分-->
        <div
          class="middle"
          @touchstart.prevent="middleTouchStart"
          @touchmove.prevent="middleTouchMove"
          @touchend="middleTouchEnd"
        >
          <div
            class="middle-l"
            ref="middleL"
          >
            <div
              class="cd-wrapper"
              ref="cdWrapper"
            >
              <div
                class="cd"
                :class="cdCls"
              >
                <img
                  :src="currentSong.image"
                  alt=""
                  class="image"
                >
              </div>
            </div>
            <div class="playing-lyric-wrapper">
              <div class="playing-lyric">
                {{playingLyric}}
              </div>
            </div>
          </div>
          <!--歌词滚动-->
          <scroll
            class="middle-r"
            ref="lyriclist"
            :data="currentLyric && currentLyric.lines"
          >
            <div class="lyric-wrapper">
              <div v-if="currentLyric">
                <p
                  ref="lyricLine"
                  class="text"
                  v-for="(line, index) in currentLyric.lines"
                  :key="line.key"
                  :class="{'current': currentLineNum === index}"
                >
                  {{line.txt}}
                </p>
              </div>
            </div>
          </scroll>
        </div>
        <!--底部按钮控制部分-->
        <div class="bottom">
          <div class="dot-wrapper">
            <span
              class="dot"
              :class="{'active' : currentShow === 'cd'}"
            ></span>
            <span
              class="dot"
              :class="{'active' : currentShow === 'lyric'}"
            ></span>
          </div>
          <div class="progress-wrapper">
            <span class="time time-l">
              {{format(currentTime)}}
            </span>
            <!--播放进度条-->
            <div class="progress-bar-wrapper">
              <progress-bar
                :percent="percent"
                @percentChange="onProgressBarChange"
              ></progress-bar>
            </div>
            <span class="time time-r">
              {{format(currentSong.duration)}}
            </span>
          </div>
          <div class="operators">
            <div
              class="icon i-left"
              @click="changeMode"
            >
              <i :class="iconMode"></i>
            </div>
            <div
              class="icon i-left"
              :class="disableCls"
            >
              <i
                class="icon-prev"
                @click="prev"
              ></i>
            </div>
            <div
              class="icon i-center"
              :class="disableCls"
            >
              <i
                :class="playIcon"
                @click="togglePlaying"
              ></i>
            </div>
            <div
              class="icon i-right"
              :class="disableCls"
            >
              <i
                class="icon-next"
                @click="next"
              ></i>
            </div>
            <div class="icon i-right">
              <i
                @click="toggleFavorite(currentSong)"
                class="icon"
                :class="getFavoriteIcon(currentSong)"
              >
              </i>
            </div>
          </div>
        </div>
      </div>
    </transition>
    <!--播放页面小屏 底部-->
    <transition name="mini">
      <div
        class="mini-player"
        v-show="!fullScreen"
        @click="open"
      >
        <div class="icon">
          <img
            alt=""
            :src="currentSong.image"
            width="40"
            height="40"
            :class="cdCls"
          >
        </div>
        <div class="text">
          <h2
            class="name"
            v-html="currentSong.name"
          ></h2>
          <p
            class="desc"
            v-html="currentSong.singer"
          ></p>
        </div>
        <div class="control">
          <!--阻止冒泡-->
          <progress-circle
            :radius="radius"
            :percent="percent"
          >
            <i
              @click.stop="togglePlaying"
              class="icon-mini"
              :class="miniIcon"
            ></i>
          </progress-circle>
        </div>
        <div
          class="control"
          @click.stop="showPlayList"
        >
          <i class="icon-playlist"></i>
        </div>
      </div>
    </transition>
    <play-list ref="playList"></play-list>
    <audio
      :src="currentSong.url"
      ref="audio"
      @play="ready"
      @error="error"
      @timeupdate="updateTime"
      @ended="ended"
    >
    </audio>
  </div>
</template>
<script>
import { mapGetters, mapMutations, mapActions } from 'vuex'
import { prefixStyle } from 'common/js/dom'
import ProgressBar from 'base/progressBar/progressBar'
import animations from 'create-keyframe-animation'
import ProgressCircle from 'base/progressCircle/progressCircle'
import { playMode } from 'common/js/config'
import Lyric from 'lyric-parser'
import Scroll from 'base/scroll'
import PlayList from 'base/playList/playList'
import { playerMixin } from 'common/js/mixin'
const transform = prefixStyle('transform')
const transitionDuration = prefixStyle('transitionDuration')
export default {
  mixins: [playerMixin],
  data () {
    return {
      songReady: false,
      currentTime: 0,
      radius: 32,
      currentLyric: null,
      currentLineNum: 0,
      currentShow: 'cd',
      playingLyric: ''
    }
  },
  components: {
    ProgressBar,
    ProgressCircle,
    Scroll,
    PlayList
  },
  // 滑动touch
  created () {
    this.touch = {}
  },
  // 填充歌曲信息 控制歌曲播放
  computed: {
    cdCls () {
      return this.playing ? 'play' : 'pause'
    },
    playIcon () {
      return this.playing ? 'icon-pause' : 'icon-play'
    },
    miniIcon () {
      return this.playing ? 'icon-pause-mini' : 'icon-play-mini'
    },
    disableCls () {
      return this.songReady ? '' : 'disable'
    },
    percent () {
      return this.currentTime / this.currentSong.duration
    },
    iconMode () {
      return this.mode === playMode.sequence ? 'icon-sequence' : this.mode === playMode.loop ? 'icon-loop' : 'icon-random'
    },
    ...mapGetters([
      'fullScreen',
      'playing',
      'currentIndex'
    ])
  },
  watch: {
    currentSong (newSong, oldSong) {
      // 当列表没有歌曲时 直接return
      if (!newSong.id) return
      if (newSong === oldSong) {
        return
      }
      // 防止歌词切换跳动
      if (this.currentLyric) {
        this.currentLyric.stop()
      }
      clearTimeout(this.timer)
      this.timer = setTimeout(() => {
        this.$refs.audio.play()
        this.getLyric()
      }, 1000)
    },
    playing (newPlaying) {
      const audio = this.$refs.audio
      this.$nextTick(() => {
        newPlaying ? audio.play() : audio.pause()
      })
    }
  },
  methods: {
    // 监听progressBar派发的事件
    onProgressBarChange (percent) {
      const currentTime = this.currentSong.duration * percent
      this.$refs.audio.currentTime = currentTime
      if (!this.playing) {
        this.togglePlaying()
      }
      // 点击或滑动 歌曲进度条 歌词滚动到对应的位置
      if (this.currentLyric) {
        this.currentLyric.seek(currentTime * 1000)
      }
    },
    updateTime (e) {
      this.currentTime = e.target.currentTime
    },
    // 格式化时间
    format (interval) {
      interval = interval | 0
      const minute = interval / 60 | 0
      const second = this._pad(interval % 60)
      return `${minute}:${second}`
    },
    _pad (num, n = 2) {
      let len = num.toString().length
      while (len < n) {
        num = '0' + num
        len++
      }
      return num
    },
    // 解析歌词 使用lyric-parser库
    getLyric () {
      this.currentSong.getLyric().then(lyric => {
        this.currentLyric = new Lyric(lyric, this.handleLyric)
        if (this.playing) {
          this.currentLyric.play()
        }
      }).catch(() => {
        this.currentLyric = null
        this.currentLineNum = 0
        this.playingLyric = ''
      })
    },
    handleLyric ({ lineNum, txt }) {
      this.currentLineNum = lineNum
      if (lineNum > 5) {
        let lineEl = this.$refs.lyricLine[lineNum - 5]
        this.$refs.lyriclist.scrollToElement(lineEl, 1000)
      } else {
        this.$refs.lyriclist.scrollTo(0, 0, 1000)
      }
      this.playingLyric = txt
    },
    // 防止快速点击 产生错误
    ready () {
      this.songReady = true
      this.savePlayHistory(this.currentSong)
    },
    error () {
      this.songReady = true
    },
    // 歌曲前进后退
    prev () {
      if (!this.songReady) {
        return
      }
      if (this.playList.length === 1) {
        this.loop()
      } else {
        let index = this.currentIndex - 1
        if (index === -1) {
          index = this.playList.length - 1
        }
        this.setCurrentIndex(index)
        if (!this.playing) {
          this.togglePlaying()
        }
      }
      this.songReady = false
    },
    next () {
      if (!this.songReady) {
        return
      }
      // 列表只有一首歌曲则单曲循环
      if (this.playList.length === 1) {
        this.loop()
      } else {
        let index = this.currentIndex + 1
        if (index === this.playList.length) {
          index = 0
        }
        this.setCurrentIndex(index)
        if (!this.playing) {
          this.togglePlaying()
        }
      }
      this.songReady = false
    },
    ended () {
      if (this.mode === playMode.loop) {
        this.loop()
      } else {
        this.next()
      }
    },
    loop () {
      this.$refs.audio.currentTime = 0
      this.$refs.audio.play()
      // 循环播放 歌词回到开始的时候
      if (this.currentLyric) {
        this.currentLyric.seek(0)
      }
    },
    back () {
      this.setFullScreen(false)
    },
    open () {
      this.setFullScreen(true)
    },
    // 设置playing状态 watch playing的变化 实现播放暂停
    togglePlaying () {
      if (!this.songReady) {
        return
      }
      this.setPlayingState(!this.playing)
      // 歌词随着歌曲播放暂停而滚动或暂停滚动
      if (this.currentLyric) {
        this.currentLyric.togglePlay()
      }
    },
    middleTouchStart (e) {
      this.touch.initiated = true
      // 用来判断是否是一次移动
      this.touch.moved = false
      const touch = e.touches[0]
      this.touch.startX = touch.pageX
      this.touch.startY = touch.pageY
    },
    middleTouchMove (e) {
      // 没有touchstart 返回
      if (!this.touch.initiated) {
        return
      }
      const touch = e.touches[0]
      const deltaX = touch.pageX - this.touch.startX
      const deltaY = touch.pageY - this.touch.startY
      // y轴距离大于x轴距离 => 纵向滚动 => 返回
      if (Math.abs(deltaY) > Math.abs(deltaX)) {
        return
      }
      if (!this.touch.moved) {
        this.touch.moved = true
      }
      const left = this.currentShow === 'cd' ? 0 : -window.innerWidth
      // 滚动的距离  最大是0
      const offsetWidth = Math.min(0, Math.max(-window.innerWidth, left + deltaX))
      this.touch.percent = Math.abs(offsetWidth / window.innerWidth)
      this.$refs.lyriclist.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
      this.$refs.lyriclist.$el.style[transitionDuration] = 0
      this.$refs.middleL.style.opacity = 1 - this.touch.percent
      this.$refs.middleL.style[transitionDuration] = 0
    },
    middleTouchEnd () {
      if (!this.touch.moved) {
        return
      }
      let offsetWidth
      let opacity
      if (this.currentShow === 'cd') {
        if (this.touch.percent > 0.1) {
          offsetWidth = -window.innerWidth
          opacity = 0
          this.currentShow = 'lyric'
        } else {
          offsetWidth = 0
          opacity = 1
        }
      } else {
        if (this.touch.percent < 0.9) {
          offsetWidth = 0
          this.currentShow = 'cd'
          opacity = 1
        } else {
          offsetWidth = -window.innerWidth
          opacity = 0
        }
      }
      // 动画缓冲时间
      const time = 300
      this.$refs.lyriclist.$el.style[transform] = `translate3d(${offsetWidth}px,0,0)`
      this.$refs.lyriclist.$el.style[transitionDuration] = `${time}ms`
      this.$refs.middleL.style.opacity = opacity
      this.$refs.middleL.style[transitionDuration] = `${time}ms`
      this.touch.initiated = false
    },
    // vue transition 动画钩子
    enter (el, done) {
      const { x, y, scale } = this._getPosAndScale()
      let animation = {
        0: {
          transform: `translate3d(${x}px,${y}px,0) scale(${scale})`
        },
        60: {
          transform: `translate3d(0,0,0) scale(1.1)`
        },
        100: {
          transform: `translate3d(0,0,0) scale(1)`
        }
      }
      animations.registerAnimation({
        name: 'move',
        animation,
        presets: {
          duration: 400,
          easing: 'linear'
        }
      })
      animations.runAnimation(this.$refs.cdWrapper, 'move', done)
    },
    afterEnter () {
      animations.unregisterAnimation('move')
      this.$refs.cdWrapper.style.animation = ''
    },
    leave (el, done) {
      this.$refs.cdWrapper.style.transition = 'all 0.4s'
      const { x, y, scale } = this._getPosAndScale()
      this.$refs.cdWrapper.style[transform] = `translate3d(${x}px,${y}px,0) scale(${scale})`
      this.$refs.cdWrapper.addEventListener('transitionend', done)
    },
    afterLeave () {
      this.$refs.cdWrapper.style.transition = ''
      this.$refs.cdWrapper.style[transform] = ''
    },
    // vue transition 动画钩子结束
    // 获取动画起始位置
    _getPosAndScale () {
      // 左下角小图片初始位置
      const targetWidth = 40
      const paddingLeft = 40
      const paddingBottom = 30
      // 中间大图片距离顶部位置
      const paddingTop = 80
      // 中间图片宽度
      const width = window.innerWidth * 0.8
      // 缩放尺度
      const scale = targetWidth / width
      const x = -(window.innerWidth / 2 - paddingLeft)
      const y = window.innerHeight - paddingTop - width / 2 - paddingBottom
      return {
        x,
        y,
        scale
      }
    },
    // 歌曲列表
    showPlayList () {
      this.$refs.playList.show()
    },
    ...mapMutations({
      setFullScreen: 'SET_FULL_SCREEN'
    }),
    ...mapActions([
      'savePlayHistory'
    ])
  }
}
</script>
<style scoped lang="stylus" rel="stylesheet/stylus">
@import '~common/stylus/variable';
@import '~common/stylus/mixin';

.player {
  .normal-player {
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    z-index: 150;
    background: $color-background;

    .background {
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      opacity: 0.6;
      filter: blur(20px);
    }

    .top {
      position: relative;
      margin-bottom: 25px;

      .back {
        position: absolute;
        top: 0;
        left: 6px;
        z-index: 50;

        .icon-back {
          display: block;
          padding: 9px;
          font-size: $font-size-large-x;
          color: $color-theme;
          transform: rotate(-90deg);
        }
      }

      .title {
        width: 70%;
        margin: 0 auto;
        line-height: 40px;
        text-align: center;
        no-wrap();
        font-size: $font-size-large;
        color: $color-text;
      }

      .subtitle {
        line-height: 20px;
        text-align: center;
        font-size: $font-size-medium;
        color: $color-text;
      }
    }

    .middle {
      position: fixed;
      width: 100%;
      top: 80px;
      bottom: 170px;
      white-space: nowrap;
      font-size: 0;

      .middle-l {
        display: inline-block;
        vertical-align: top;
        position: relative;
        width: 100%;
        height: 0;
        padding-top: 80%;

        .cd-wrapper {
          position: absolute;
          left: 10%;
          top: 0;
          width: 80%;
          height: 100%;

          .cd {
            width: 100%;
            height: 100%;
            box-sizing: border-box;
            border: 10px solid rgba(255, 255, 255, 0.1);
            border-radius: 50%;

            &.play {
              animation: rotate 20s linear infinite;
            }

            &.pause {
              animation-play-state: paused;
            }

            .image {
              position: absolute;
              left: 0;
              top: 0;
              width: 100%;
              height: 100%;
              border-radius: 50%;
            }
          }
        }

        .playing-lyric-wrapper {
          width: 80%;
          margin: 30px auto 0 auto;
          overflow: hidden;
          text-align: center;

          .playing-lyric {
            height: 20px;
            line-height: 20px;
            font-size: $font-size-medium;
            color: $color-text-l;
          }
        }
      }

      .middle-r {
        display: inline-block;
        vertical-align: top;
        width: 100%;
        height: 100%;
        overflow: hidden;

        .lyric-wrapper {
          width: 80%;
          margin: 0 auto;
          overflow: hidden;
          text-align: center;

          .text {
            line-height: 32px;
            color: $color-text-l;
            font-size: $font-size-medium;

            &.current {
              color: $color-text;
            }
          }
        }
      }
    }

    .bottom {
      position: absolute;
      bottom: 50px;
      width: 100%;

      .dot-wrapper {
        text-align: center;
        font-size: 0;

        .dot {
          display: inline-block;
          vertical-align: middle;
          margin: 0 4px;
          width: 8px;
          height: 8px;
          border-radius: 50%;
          background: $color-text-l;

          &.active {
            width: 20px;
            border-radius: 5px;
            background: $color-text-ll;
          }
        }
      }

      .progress-wrapper {
        display: flex;
        align-items: center;
        width: 80%;
        margin: 0px auto;
        padding: 10px 0;

        .time {
          color: $color-text;
          font-size: $font-size-small;
          flex: 0 0 30px;
          line-height: 30px;
          width: 30px;

          &.time-l {
            text-align: left;
          }

          &.time-r {
            text-align: right;
          }
        }

        .progress-bar-wrapper {
          flex: 1;
        }
      }

      .operators {
        display: flex;
        align-items: center;

        .icon {
          flex: 1;
          color: $color-theme;

          &.disable {
            color: $color-theme-d;
          }

          i {
            font-size: 30px;
          }
        }

        .i-left {
          text-align: right;
        }

        .i-center {
          padding: 0 20px;
          text-align: center;

          i {
            font-size: 40px;
          }
        }

        .i-right {
          text-align: left;
        }

        .icon-favorite {
          color: $color-sub-theme;
        }
      }
    }

    &.normal-enter-active, &.normal-leave-active {
      transition: all 0.4s;

      .top, .bottom {
        transition: all 0.4s cubic-bezier(0.86, 0.18, 0.82, 1.32);
      }
    }

    &.normal-enter, &.normal-leave-to {
      opacity: 0;

      .top {
        transform: translate3d(0, -100px, 0);
      }

      .bottom {
        transform: translate3d(0, 100px, 0);
      }
    }
  }

  .mini-player {
    display: flex;
    align-items: center;
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 180;
    width: 100%;
    height: 60px;
    background: $color-highlight-background;

    &.mini-enter-active, &.mini-leave-active {
      transition: all 0.4s;
    }

    &.mini-enter, &.mini-leave-to {
      opacity: 0;
    }

    .icon {
      flex: 0 0 40px;
      width: 40px;
      padding: 0 10px 0 20px;

      img {
        border-radius: 50%;

        &.play {
          animation: rotate 10s linear infinite;
        }

        &.pause {
          animation-play-state: paused;
        }
      }
    }

    .text {
      display: flex;
      flex-direction: column;
      justify-content: center;
      flex: 1;
      line-height: 20px;
      overflow: hidden;

      .name {
        margin-bottom: 2px;
        no-wrap();
        font-size: $font-size-medium;
        color: $color-text;
      }

      .desc {
        no-wrap();
        font-size: $font-size-small;
        color: $color-text-d;
      }
    }

    .control {
      flex: 0 0 30px;
      width: 30px;
      padding: 0 10px;

      .icon-play-mini, .icon-pause-mini, .icon-playlist {
        font-size: 30px;
        color: $color-theme-d;
      }

      .icon-mini {
        font-size: 32px;
        position: absolute;
        left: 0;
        top: 0;
      }
    }
  }
}

@keyframes rotate {
  0% {
    transform: rotate(0);
  }

  100% {
    transform: rotate(360deg);
  }
}
</style>
